I love the diversity of the workouts. Fastest hour of working out I've ever had. The instructors change up the workout routine so you don't get bored. The music rocks. I can't say enough good about orange theory.
I am a runner and obsolutely love the treadmills as part of OTF! I haven't found that anywhere else. I also love the variety, coaches and music. And I can always find a time and location that work for my schedule, which changes every week. I love OTF!